Davit-gearing and casing.



A. E. J. LUCKHURST.

DAVIT GEARiNG AND CASING.

APPLICATION FILED OCT. 20, 1915.

(m 1 t mm n W w Nm mm M m L M m z m/@ w A. E'. J. LUQKHURST. DAVIT BEARING AND CASING.

APPLICATIONYFIlED OCT. 20. m5.

Patented Nov. 21, 1916.

2 SHEETSSHEET 2.

mm MJW Mf fi UNITED STATES PATENT OFFICE.

ALLEN E. J'. LUCKHURST, OF RIDGEWOOD, NEW JERSEY.

D AvIT-GEARIN G AN CASING.

Specification of Letters Patent. Patented NQV. 21, 1916,

Application filed October 20, 1915. Serial No. 56,887

part of the application for boat launching device, executed by me this day preparatory to making application for'Letters Patent of the United States therefor." A

The object of my presentinvention is to provide a gearing that is easy to operate to rotate the davit in launching a life boat, as well as etlicient in use.

A further object of my invention is to so construct a casing for the gearing that water will not only be excluded from the gearing, but the casing itself will form the support for part of the gearing as well as being supported by another part.

The invention is illustrated in the accompanying drawings, in which Figure 1, is a plan View of a portion of the deck of a ship and of three of the davits with my invention applied thereto; Fig. 2, is a plan view of the gearing. casing, the davit being in section, and the view being on an enlarged scale; Fig. 3, is an elevation of the casing, with a portion of the davit protruding at the lower side thereof,-the View being an elevation from the side of the sheet; Fig. 4c, is a plan view of the gearing, the casing and davit being in section;z

and, Fig. 5, is an elevation of part of the worm gear, an elevation of the worm in full lines, an elevation of the spur gears, and of a portion of the davit, and a sectional view of the casing, clamping bolts, and shafts.

In the drawings, like numerals of reference refer to the same paz ts in each of the views.

In Fig. 1, of the drawings I show the davits 6, carrying the gearing 7 to rotate the same, the operative shafts 8, therefor held over the deck of the ship by the standards 9, through a portion of which the shafts pass, as clearly shown, whereby the shafts are always held so anyone can use one of the cranks .10, to rotate the same without danger of being lurched overboard. The shafts 8, are jointed at 11, so that in case of necessity: the shaft can be discon nected, and the davit rotated as an ordinary davit.

- The gearing itself comprises a worm gear 12, composed of two parts 13, and 14, which are clamped upon the davit 6, to form the gear 12, by bolts 15; and in order to hold the .worm gear 12, more securely in place onthe davit I provide set screws 16, and 17, mounted in the respectiveparts 13, and 14:,

whereby thegear i held against any movement, either turning on the davit, or slipping along the same The worm gear 12, has a hub provided on each side thereof with an extension 17', on

which thecasing '18, iszmounted in a manner to be supported bythe hub, as clearly shown in Fig-5, while I'mav provide a packing 19, of any suitable material to prevent the entrance of water within the casing. As

thus constructed the worm gear will be held 1 on the davit in: a very firm manner, and the casing will be held on the worm, gear in a firm manner. Mounted in the casing 18, is a shaft 20, on which'is fixed the worm 21,

in mesh with the worm gear12; and this shaft also carries the spur gear 22, in mesh with the pinion23, on the shaft 8, which may be rotated.- as described above.

The casing 18, is conveniently formed in three parts, as more clearly shown in Figs. 2, and 3. As shown,a cored casing 24, has bolted on one side thereof a, cap, forming therewith an inclosure for the worm gear 12,; and on the opposite side is bolteda cap 26, which forms with the part 24, bearings for the shafts 8, and.:.20. By makingall joints tight a substantially water-tight casing will thus, be provided. The casing thus formed is carried on the hub and extensions of the worm gear 12 in a firm manner; and as thus formed, the casing itself carries the worm and operative gears and shafts therefor, as clearly shown.

In operation, when it is desired to rotate one ofthe davits, the corresponding shaft 8, is rotated by means of the crank 10. This causes the pinion 23, mounted thereon, to rotate, thereby rotating the gear 22, and the worm 21. As this worm is in mesh with the worm gear fixed on the davit, the davit itself will be rotated in either direction as the shaft 8, is rotated in either direction, as will be understood. Owing to the construction of gearing, the davit will be rotated without the exertion of as much force as is usually required to rotate the same partially to swing out, or in the lifeboat carried thereby, as will be understood.

The construction is simple and efficient, and can be manufactured at a low cost.

I claim:

1: A davit gearing and easing comprising a gear removably fixed on the davit, a casing carried by said gear, and operating mechanism carried by said casing.

2'. A davit gearing, and easing comprising a worm gear composed of two parts clamped upon the davit, a casing mounted upon said worm gear and inclosing' the same, two slraftscarried by said casing, a worm carried by one of said shafts in mesh with said worm gear,- and gearing mounted on said shafts whereby said worm may be rotated, for the purpose set forth.

8;: A davit gearing and easing comprising a wormgear composed of two parts clamped upon the davit, a set screw mounted in each of said parts and engaging the davit, said worm gear having a hub with extensions on the opposite sides, a casing mounted on said hub surrounding said extensions, an operative shaft mounted in said Casing carrying a pinion, a shaft mounted in said casing carrying a gear in mesh with said pinion and carrying a worm mesh with said worm gear, for the purpose set forth.

, 4a; In combination, a davit, gearing mounted thereon and carried thereby, a casing mounted on said gearing and inclosing the same in a water-tight manner, an operative shaft extending from said gearing over the deck of the ship, and means to hold said shaft in substantially fixed relation relative to the ship,- for the purpose set forth.

5. In combination, a davit mounted on a ship,a' gear mounted on saiddavit, a casing mounted on said gear in a substantially water-tight manner, an operative shaft carried by said casing, and gearing in said casing and carried thereby connecting said operative shaft with the gear on said davit, for the purpose set forth.

6. In combination, a davit mounted on a ship, a worm gear mounted on said davit, a casing mounted on said form gear in a substantially water-tight manner, a shaft mounted within said casing and carried thereby, a worm on said shaft in mesh with the worm gear on said davit, a spur gear on said shaft, an operative shaft mounted in said casing and extending through a stand ard on the deck of the ship, and a pinion on said operative shaft in mesh with the spur gear on said first shaft, for the purpose set forth.

7. In combination, a davit mounted 'on a ship, a worm gear mounted on said davit, a casing mounted on said worm gear in a substantially water-tight manner, a shaft mounted within said casing and carried thereby, a worm on said shaft in mesh with the worm gear on said davit, a spur gear on said shaft within said casing an operative shaft mounted in said casing and extending through a standard on the deck of the ship, a pinion on said operative shaft in mesh with said spur gear, and means to disconnect said operative shaft from said standard.

8. Adavit gearing and easing comprising a worm gear removably fixed on the davit, a casing carried by saidworm gear, a worm within the casing and operating mechanism associated with said worm.

9. The combination with a boat davit, of a gear mounted thereon, a revoluble shaft having a worm meshing with said gear, means engaging said gear adapted to maintain the worm of said shaft in engagement there,- with, and means adjacent said gear for sup? porting said revoluble shaft.

Dated this 19th day of October, 1915.,

ALLEN E. J. LUCKHURST.

copies orthisp 'sitent may be obtaixi'edior five cents each, by addressing the Commissioner of Patents,

Washingtonfl). 0. 

